1986 Volume 2 Issue 6 Pages 567-570
In a sealed PTFE bomb, the purification of acids used for decomposition and the decomposition of standard botanical samples (NIES-CRM No. 1 Pepperbush and No. 7 Tea leaves) with these purified acid vapors were simultaneously carried out in the same vessel at an elevated temperature. A significant decrease in the sodium blank level even from the acids containing 800μg/g sodium was observed. The very low blank level thus attained enabled sodium in Tea leaves to be determined at as low a level as 0.30μg/g in the sample solution, with a very good precision, by "one drop" flame emission spectrometry. With this decomposition method, iron, manganese and zinc in Pepperbush and manganese and zinc in Tea leaves were satisfactorily determined.